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Prog Neuropsychopharmacol Biol Psychiatry. 2010 Apr 16;34(3):441-5. doi: 10.1016/j.pnpbp.2010.01.013. Epub 2010 Jan 25.

Overflow movements and white matter abnormalities in ADHD.

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1
Unit of Child Neurology and Psychiatry, Department of Neuroscience, University of Rome Tor Vergata, Italy. elisadagati@gmail.com

Abstract

Multiple motor abnormalities have been identified in some children with Attention Deficit/Hyperactivity Disorder (ADHD). These include persistence of overflow movements, impaired timing of motor responses and deficits in fine motor abilities. Motor overflow is defined as co-movement of body parts not specifically needed to efficiently complete a task. The presence of age-inappropriate overflow may reflect immaturity of the cortical systems involved in automatic motor inhibition. Theories on overflow movements consistently implicate impairments in white matter (WM) tracts, including the corpus callosum. WM connections might be altered selectively in brain networks and thus influence motor behaviours. We reviewed the scientific contributions on overflow movements and WM abnormalities in ADHD. They suggest that WM abnormalities in motor/premotor circuits, which are important for motor response inhibition, might be responsible for overflow movements in patients with ADHD.

PMID:
20100533
DOI:
10.1016/j.pnpbp.2010.01.013
[Indexed for MEDLINE]
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